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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b658ac79e07b4f4ce791cdcea8540d2ecfa0f6f58ee3df43b5938837e2a8289' 
  AND token = 'yuADROjbImcalGtZrzslxiguf1t9icIVAtlLp5Eoe10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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