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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7a9c0c72454119af0fe78f771776ba0fa12a9712adf58d993df95a781d9d96' 
  AND token = 'KKKraZj1wPAeUs2dlx3/mbTe4ptpsboUGhCJgzOha7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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