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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3377fbab77325d83439ecfefab804d546f128a09bf70ac07cbee6b5b048e4db' 
  AND token = 'ZWNgSFsidpDeGF4N0SUAi+QOyx+eZ/TSjzAQs/vh3Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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