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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fd908bd253af5f22632d302b54c580c82ca20b79819355d636e7cd16b3ea1c' 
  AND token = '+xPGAv+xDOrs4TpvSiyJ8K+vayjD3eAi++jGHwB7Ib0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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