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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ca01e5ff90f49cef081be7e3d77694d07236e15498ea295377c198ca416936' 
  AND token = 'cTXIfD7b5yEUoVtp9Is/ds5m29rr+rFgPCNFwqWcW7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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