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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1a128dbedb29bb1463bb63a275862aff544437f6467d2e8c31e13ae1e073a4' 
  AND token = '9pf8k2Tj8/4orHOdmsoSYljG6B5AvKkbYCYCcWVXzlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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