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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a1462869450ad239f4c1832ee7f1d89c3f40ad5a3459dbc91f9625c29689c4' 
  AND token = 'ayfYPpnJzt/t943b/6dnMpDLr6h8qppEnvHaGujU0RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}