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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e1970d7c74496e4d1875fc880c45f5f3925d681a6e7c0170c61c5c7bd0b818' 
  AND token = 'Cdi5tXA6Z9qlqr8hPUR63Cjm7gi58XUTjiqjK676HYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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