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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b670fe346120816531611f281444f59c410c4fe3e110ba26bc07fb6208c7385b' 
  AND token = 'GKFE4xijIztkzPexINnE6SpcavFKZHapR3ksGu3tEGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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