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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b325ab36a6357d5c6bd0ee06946c4174145d8eaf17d16f39d8e8f2d4636f62' 
  AND token = 'idlEaLbNJA160L5jguiNVFIIGnOk594u51BcgM5XQa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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