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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77412d17acd1a8aeba1edcc1d37d0f31e23ccb153bc6d50d2d16b217c1361035' 
  AND token = 'dZCeszsJrY0xOjJq+ZOcoJg9Wndi6AY4augBLhD+jdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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