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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17107e3c7dcafaaf7f020e24c1fd8a67f868baf5c230b47703e7d6ab126444d' 
  AND token = '3q9IDZeKTnGpQb/25SHlrWBXlLN05EaEiJN9bOJf/80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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