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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6873ef80a72aa0d2841c1c1dce07e4793c63947d62b163de3cf42941784b90bd' 
  AND token = '0XrnNHzawWQ0/muMUWp/rqiDZSGVz8u+b3d8EedVL3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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