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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8bc414983888e780813c5a9c019700ce067e096c1af64a4a261465dcb64b6f' 
  AND token = 'MB6+NE+gfmR/hjF4BSwkx8u+Njf0I41UEiFo8jc4CWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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