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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892b0e7ae95d28d96accab865414b5ca0b534a86be49f0ea0060cd91325454ab' 
  AND token = 'ET1AKb3ohaqlQo23MMZwjbtDoVOp9Nr4IVomCVH/vHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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