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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a95dd4843132cfaeb0c9701ab99fa936463df4ba7cbc78a86f8b79c5a3f724' 
  AND token = 'APeQp0s3uk7qb1Ctq0+BxP7kdK2ChTXfXefEQg5Yy8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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