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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a148b11671928e21cfb5bbf1a006fbb4fa7f65be9b6325bccff0906cd5a59e4' 
  AND token = 'jYRZXx9GfQaPPreOKNfmQl6/xS/+lcP0m8QR6rBpWqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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