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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17579dfbd683392e42e2d24604f4151acb1deea8eb6c3f7e02a24e3761bf7c80' 
  AND token = 'SKaF7Dysno7ZvM58MzniMcvKm5IFnOofhZ6mimFSmac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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