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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0d11fbdc727259127aace62ed80261c6b18e3d3e02d603638ead6c1e29d854' 
  AND token = 'YaX7EugkFkH0eKl47HbY0oNoa9H6MUEqc9KO+zwA0OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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