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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e0f8f4e8c62c43a74ced18f465904115116a77336fa465c42d365423610780' 
  AND token = 'lVKV1hk19+Yhb1XvBNnFEu/Ff8h/4OyLtwCKFpFM/yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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