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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1b13cc5835e32a765754c4753d9669c5c8a7c151922490b74946f1d70c8416' 
  AND token = 'elUGm6aDWDFslBkyBMq/Pr0sH3g8Ff6607YePSiTmc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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