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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2aafcba5a691ca83d5a3abe6aa8a2d3c930fdf07cc54701a90773c2d0f2d6b7' 
  AND token = 'j2H1WM5tf3+gak4IWBtFN6qSWz27xXcCm68bm6vLDyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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