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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e173214379ab79ef0cc631f0c9cc22b8957aff03ef8a97f14607717fd889f1d5' 
  AND token = 'h0Fk3nzfBqYlAyZE92TIv8t4D9IWDEsiEjrq0k+9FH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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