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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacced2894ad9069c7338664b88e58f6caeddb30c11a285267dfbd760d693f0b' 
  AND token = '4mG+J+Tz3pudZxzLAAkiF+7AY9FcUGge1OQvEnoGOv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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