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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4942b2019b4e3bc59506f513135b80e2f4a074af2c472d51907e5b75ea5ecc' 
  AND token = 'jlqftJ8TWkrvpc4CeCYqlhKKldaVv/Uq4EKNO7cWfUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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