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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da61bbd6076006e5be9f8bdecf85670cb9709de3d93d0e762dc9a8bb9c5820c' 
  AND token = 'uFnseG2LHkIkvrLjj7Av6jwbxBsY6rYBaVnJu63IRZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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