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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b8535809c1d361097d47811ff8e5ad2d2ad66e7d048174980dce1c98bfce63' 
  AND token = 'jG1DToV6rrH8MfjJ8Sp9CT6N0gTRrY/ChVErWwqn7rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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