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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8d3b0e0a8ebbe876e1a525e811766438cf85df21c71fdbce67ec87422b8259' 
  AND token = 'LtMqLETag4DVEeNxAs5vEc7C6j+ZhhYyxaI9HrO+oKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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