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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c026e337397804e8548cd87aab80ecd7556bd879f62385f93eec11be42ea965' 
  AND token = 'Y8R39UEbCUfQ1q5UehesIzIVMz3RUe3Ay452jHnQvWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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