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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80059eac3f61674fa4935be1b025f9e0946b9526d1d4e564a1e940db620ce77e' 
  AND token = 'iFeFaN6ilfI2Zzixij8CVOHEkf6uPQXt/vl3inaJ4Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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