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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af824ea2caceb21929a29b89180c9c71693945c710de7279e94e99655c276c1' 
  AND token = 'N/E5+uV1SS5AT8Svcmgl2Z88CZgelpyp6Sh31A3R48M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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