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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54147c35aa439f188966ae3987bd9a59500c72db1e10b8a059fe603700211b98' 
  AND token = 'wWynHFgtDrZ+ddAlM1aWyNSnYDK6t+7puDb0Fg/gp7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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