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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3c649f5208a6d8b92899eb39157b47d32b58899bcb81fd6ac41e85214cc30a' 
  AND token = 'PvBefN4YUkbJXv7Mf1iToHAf5b9tQ+ijr31/9HO90f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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