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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da394ee89ed737db74997cbb7985bf75911604575322ad7ff6cece0c5badded' 
  AND token = 'a4REJ6vJi+90vIl8rpx7hv2K0F0jSWhOp+Y9quVbCLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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