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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ffbcb209466e2aa81a95f1676c301843ab104803c4aa96b8d631a24d6fc0f9' 
  AND token = 'TdIh6goL+iaIrcoMPv/hgaEcETuAbPAqhx+O6jYxDbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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