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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6013ac8fb6d70d4111cfe739ea8e87ac66380179ae4a62484ac79292be08e0d0' 
  AND token = 'uWFhYgA0AchvimgTIxtY6Omy9f06Qi7MsV3V5SQeA8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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