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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd4437b8d6299b629481bcdd871a0a3957a4e593ab4a99c9b6a1d9e285b7166' 
  AND token = '8LSbytwjzNMZ8xiIQC34+W3NugML+H8bQ+T8zi8tTSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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