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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560ffe0a5e7f2ff0c894475aca3444dc8d158852a7f395e110d3417ef38be39f' 
  AND token = 'mHP5XF5cXF9KrqotFrcOBn8XVMPJmHDYdI4zx0JbecQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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