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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c880b17bcc6da9d725279f48e2d6231b9b50b526149304eed203c34d008c8323' 
  AND token = '4PWgKo8CS85XMJVPM6y5KyImBBtYocolc9VaPemxLhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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