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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abbb59c08ed0e023c7dadaa106edbbdbe0849a07df3b6a0f93a8f2ebbb8eaa3' 
  AND token = 'qmaYyCg1rhQ+Bn2fka5mDE6Hqw36chvlYC+pKOqB5jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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