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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805d732b6a63d7f76c69ce22984490297c4e6a2dee0ffdf4c62121a63a96ec9f' 
  AND token = 'M90i5WNnbi8+I4TKFQIWNQt5JwybTKwzQdTKu6WLfko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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