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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4be9ef4e055ef77ee03094e84e8ed4b2c97ba4a48875e767814c9dafa09500' 
  AND token = 'PnYTRZbk6yzRw+YpcA6/Id/b1K4pys0bmmot3hNRlOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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