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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6cb834dce541416681af155f42d655a7b37d79e581522421fe596f833d973f' 
  AND token = '0DsuremtVK7K+4AjjsdXL4B5R3HOXvvhOE8rxPXLUXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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