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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cacf5b2d6816e88f9d74ad4009e0bd1c7976b61b87aa68465c68ebc7ff3da0a' 
  AND token = '31BOSnRhp/FQw8ueDVxai2GWhKSdtyG1xt8BAKwzt8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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