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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63d7c48f7d0e00729ec138a5dc9491c163ce83d28110537048e3ac4bf2db3ae' 
  AND token = 'iaKt37W/pUydFZxI8mLhCaF1/7+2BKfy6m05FcxZ7Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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