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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0932bc880cac2d974367cf516cbbe44300bb9c440371b1d04ea3c61698af8eba' 
  AND token = 'R2wl5zAQeXwego60KG3tghb10/cqe80PALaaNOGxpgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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