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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662126a692ba8f2282506b8cbfb556ad6ff2927467b697a3e91722a23be63a43' 
  AND token = '9ma+JQvSilisCHGeNdWwo7aT1sEMZq7KDw+mYBX1UXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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