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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89425dbc0cc7d94afc0257d73b090f3ab735ecf9fdb8df45280bbaea34404360' 
  AND token = 'S58GjzfH8aMgNrNalGdzyO+m/mjMqzICue9Zi8hra/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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