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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035aa242d705839a8290f7143d4fbde6178db1802f765578d7255ab0df2da798' 
  AND token = 'dm29LxoBNuGLzfjaXrF8YK8ONXr1a8qWV4ie43mOja8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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