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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a243835caaefc48e7f27403c0b971955e498723b9ccc43600e514ee7b589bbb0' 
  AND token = 'a+zkn5qFyJYV2Z2YL9An1cWvmIEkah1m171hsl+4u4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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