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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b5aeba34cd1857407e462e60de40e609350bcf7bdcd9de306495b64bae7619' 
  AND token = 'nFMeyCenw8FsFPO/0wYzsEMgN9EBV+U0+TlRp5DA/pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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