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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef3744dc317c4f161837fee3782a13994c2a66be11dae5047dbb8215e9b4fae' 
  AND token = '3yoGeVLX29VPwzb+wVyuZe3vaTtGk9jGQhARAJyuBIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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