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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203f3dc8e320b612ccc7e60a6ac8052f48812332320dd56a85a8f83d84f8fc28' 
  AND token = 'cv4/5hHnPEtzrvT1EE/N+aNGtf1NEKdNZV8JXaDpkwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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