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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09605eb78d3f3859aecb203880d66ee17c2483402893b71284bce998a1855e89' 
  AND token = 'of/TgTyoomirVa/JktcIE0eDpkUgErH43enFiAipYfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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