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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca971fdaa8c4ae921dd8ba5a89a7e670fac00dc0acba63e092057addfcac45b' 
  AND token = '30UDU1lJutPpvr+zSZYjDnhgHjJV/b9cWuCs1zVNj6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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