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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d021e4618acad02e0dcd43f24e9286d9f64059fb0b366aa224a63e4e766d97' 
  AND token = '/rcK93Q9pW2n9WFRVsMOi8OZ23q3+YTZkN4kHMnXdVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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