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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f353d2e970820bcc55301493f96437f942d83673c8387273bb9ec456d6e4d095' 
  AND token = '3BDceOjksBlO2xav5yN5IDuspbyAW+ocLDeUw6teAJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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