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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e26a77ab89ff4ec0716e87074a89bac90f917b689b80f516b111649dfec14b' 
  AND token = 'wRFt+cC4c2MAkTlJEROMjtB5KUzGq8kd+5MNWt2+lnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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