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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce2debe77eb38a7ca144a119b294acdeac58874967ed999666a36384b5333e0' 
  AND token = 'NHFo64mJEud1Is3l40eiZ5Ipo9babV37FGQ4H3ffK8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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