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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d7ef087031efa2f8817bbc7d239b520b7f5208affa8ae0d1c467a983409190' 
  AND token = '+v4+VB20Vvj74zh8uE7Ztljz3gOZfL9phQI0jto4BoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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