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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812702b3ee966c9b6c38edacd7e8fa156fedce34edd116188c816e8b4b74544a' 
  AND token = 'omLb9VBFm+R3YAEfny3HYYg7CAo50462GqcHCd5nqe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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