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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1030b9a900cd2a55ea0e1240c0996c875c20f970dc4680ff3e8d6f756b6cce' 
  AND token = 'DTPWZaUaseboS8f71hAOMpkn2YR3Z3PgWSm2+XDDT5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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