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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec38a2cc82f70383be69420b4f7101c1d6a9ec3beee49c89119ecf72f677da14' 
  AND token = 'FXddU2sEH/54CBt8Q+CwCemFMyOUzc4jAjzfFn1nxQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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